The OSI Model

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  • Is it possible to convert a Layer 2 switch to a Layer 3 switch?

    In this expert response, our networking fundamentals expert, Chris Partsenidis, talks about the possibilities of converting a Layer 2 switch to a Layer 3 switch.  Ask the Expert

  • OSI: Securing the Stack, Layer 4 -- Fingerprinting

    At Layer 4 of the OSI model, the transport layer, a major security threat is fingerprinting. Learn how active and passive fingerprinting can endanger your network -- and what you can do to prevent fingerprinting -- in this tip, part of our "Securing ...  Tip

  • Extending OSI to Network Security -- Chapter 1 of 'Hack the Stack'

    Extending OSI to Network Security covers topics such as common stack attacks, mapping the OSI model to the TCP/IP model, and talks about the current state of IT security. The goal of this chapter is to take the well-known Open Systems Interconnect (...  Chapter Download

  • OSI: Securing the Stack, Layer 3 -- The role of ICMP

    Michael Gregg examines the security vulnerabilities of Internet Control Message Protocol (ICMP) and how to help secure OSI Layer 3, the network layer.  Tip

  • physical layer

    In the Open Systems Interconnection (OSI) communications model, the physical layer supports the electrical or mechanical interface to the physical medium.  Definition

  • layer 2

    Layer 2 refers to the Data Link layer of the commonly-referenced multilayered communication model, Open Systems Interconnection (OSI).  Definition

  • Network layer

    In the Open Systems Interconnection (OSI) communications model, the Network layer knows the address of the neighboring nodes in the network, packages output with the correct network address information, selects routes and quality of service, and reco...  Definition

  • Session layer (port layer)

    In the Open Systems Interconnection (OSI) communications model, the Session layer (sometimes called the "port layer") manages the setting up and taking down of the association between two communicating end points that is called a connection.  Definition

  • OSI (Open Systems Interconnection)

    OSI (Open Systems Interconnection) is a standard description or "reference model" for how messages should be transmitted between any two points in a telecommunication network.  Definition

  • OSI: Securing the stack, Layer 2 -- Understanding the role of ARP

    Security expert Michael Gregg continues his layer-by-layer discussion of OSI model network security with this tip on the vulnerabilities present in Layer 2, the Data Link Layer, and specifically addresses the Address Resolution Protocol.  Tip

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